I am struggling a bit with the nuances of on and off topic questions. Is this question on topic? If so under which acceptable question format does it fall? Don't misunderstand me, I'm not pointing fingers at anyone: I'm just trying to get a better feel for this.
I think it's basically a (current) history question. Answers would be based on statistics showing how widespread it is, or (as the one answer so far does) show a policy instructing it to be widespread.